Double brake.



J. 111151111131311 DOUBLE BRAKE. APPLIGATION FILED AUG. Vp4, 1905 1,01 1,200. y Patented Dec.A 12, 19.11.

2 SHEETS-SHEET 1.

ATT0RNEY1 J., D. IHLDBR. DOUBLE BRAKE. APPLICATION FILEDAUG. 24,1905.

Patented Dee.4 12, 1911.

yf/5 Mm rigidly to.' the bed-plate 1 is a frame 6 to i with central openings through which are adapted to move t-he`cores 11 and 12. `13` To all whom it. may concern:`

35. 1 make a close et with the can Plates 9 and 10= UNITED sTATEs JOHN nf ninDEn, y ,JERSEY CITY, NEW JERSEY.;

.DOUBLE BRAKE.

Be it known that I, JOHN D. IHLDEE, a

citizen of the United States, residing at New "York city, in the county of New York `and State of New York, have invented a new and useful Improvement in Double Brakes,

of which the following is a specification.

l My invention relates to brakes, and one of its objects is the provision of independent 'brake-applying means so arranged that if certain parts should become disabled to prevent one brake shoefrom being applied the other shoe would still be effectively applied. Other objects of the invention will appear hereinafter, the novel combinations of elements being set forth in the claims hereto appended.

"i AReferring' to the drawings, Figure 1 represents in elevation, with certain parts in section, one form'ofmy invention; and Fig. 2 represents ak modification thereof.

' In "F ig. 1 the reference lnumber 1 design ates"the bed-plate of a motor to the shaft 2of'which secured by means of the keys 4, "5ba friction or brake pulley 3. Fastened the center of which is secured the standard 7 Lfr supporting the cylindrical frame'8 of the brake magnet. Cap plates 9 and 10 close the ends of the cylinder 8 and are provided designates a spool of insulating' material on which is wound the solenoid 14.

y It will be noticed that the cores 11 and 12 respectively, and are actually in contact with vthe same at all times,"but it is to be under- 1 stood that these cores may move freely in and out ofthe holes in these cap plates. Preferably the'cylinder 8 and cap plates are made of iron or soft steel sothat a complete,v

magnetic circuit for the magnet solenoid is obtained with the exception of the small air thefbrakeshoes ,5.0. f j [fhebrake levers 19jand '20 are pvoted gelectromagnet.' The upwardly extending' gap between the inner inc losed ends of the coresll andv 12. Thisair'gap can be made quite small as it requires only a small movement of the brake arms 15 and 16 pulley 3.

respectively tothe brackets and 2,6 which are' rigidly rsecured tothe "cylinder Skof the bushings 36 and 37 which I to release j and 18; Afronti the brake" PATENT oEEroE'.

or NEW YORK, N. Y., AssIGN'oR Tofo'rrs ELEvA'roR COMPANY, or

CoRroRATrN or NEW JERSEY.`

Patented Dec.y 12, reir,

arms 15 and 16 of these levers are curved to conform to the periphery of the brake pulley 3, and their inner faces are provided with a material having a high co-eicient of friction so das to constitute efficient brake shoes 17 an 18.

downwardly spectively, pass the rods 27 and 28 which are rigidly .connected to the centers of the outer ends pf the c res 11 and ,12. outer ends of ttl/e rod 27 and 28 are screwthreaded and provided with adjusting nuts 29 and 30, respectively, and also locking nuts 30 and the arms 21, 22 are bearing plates or washers 33, 34, respectively. It is now uclear that when the electromagnet is energized the cores. 11 and 12 will be drawn in-i wardly to close the air gap and that the levers 19 and 2O will be rocked .about their out of engagement with the brake pulley means, I will now describe the brake applying means. Through screw-threaded openings in the extreme lower ends of the arms 21 andl 22 are passed the screw-threaded are provided` with longitudinal holes 44 and 45 for receiving the rod 39. This rod is of smaller diameter than the longitudinal holes so as to allow a certain movement in Iarc of the arms 21 and 22 of the ybrake levers 19 and 20. The rod 39 also passes throu h an enlarged opening 38 in the standard The standard'7 between the frame Gand magnet cylinder 8 is provided with circular shoulders 42 and 43 over which lit the immer ends ofthe helical springs `46 and 47, respectively. The outer ends of the springs '46 and 47 lit-over circular shoulders 50 and 51, respectively, ofthe disks 48 are loosely -mounted'on the rod 39 so as to allow the sanne to have a longitudinal movement on saidrod.

' nuts 52, 5 3l are placed `on its propenfposition,

the screwthreaded ends of this. rod. If de- Through perforations 25 and 24 in;4 the extending arms 21 and 22, re-

The 4 Having described the brake releasing` It will be noticed that the rod 39 passes- 31 and 32. lBetweenvthe adjusting nuts 29,

pivotal points 23 and'24 so that the brake?.` shoes 17 and 18, respectively, will be held and 49. which i sired, however, theA rod 39 may be screwthreaded at its center and passed through a screw-threaded opening in the center of the standard 7, in which case lock nuts would be placed on each side ofthe standard 7 so that the vibrations of the apparatus could not unscrew the rod and nally displace it entirely. I prefer, however, the const-ruc- I- tion shown with the openings 44, 45 and 38 of' larger diameterl'than the rod 39 so as to allow certain up and down movement of 'the rod 39 bodily. The'disks' 48 'and 49 are also provided with enlarged openings 54 and 55. The springs 46 and 47 are very powerful. and therefore' maintain the spherical projections 56 and 57 of these disks in frictional engagement with the inner spherical ends of thescrew-threaded bushings 36 and 37 ,and so that the. opening 44 shall be in alinement with the opening 54 ,andf the opening 45 in alinement with the 'open' lng. s .'jl

WVhen the electromagnet isenergized, tlfe lower arms 2l and 22, are drawn inwardly and so also the bushings 36, 37' which trans- 'fmit `pressure through the disks 48 and 49 to the springs 46 and 47, to compress the same.- At the' same time the brake shoesfare 'ref -leased from the brake pulley 3 and con- .sequently the driving shaft2 can notamevolve. In order to stop'the mot-or connected the brakes'hoes `17 and 18. With the eXcep-'i lto this shaft the magnet is denergized whereupon the springs 46 and 47 act to move the arms21 and 22 outwardly and the arms 15' and 1,6 inwardly, respectively, to apply tion' of the rod 39 which prevents the disks 48 .and 49 from 'beingdisplaced'and consequently also the brake-applying springs, thev brake'levers and connections are entirely inf dep'endent of each other.- In the usual form l of brake, a single spring is employed or the springs are so arranged that vif oneessential part of the brake mechanism is'disabled the whole structure becomes inoperative. But with' the present construction if one of the springs should break or one of the connections '-give way, the brake shoe' on the. oppof Qsite' side, instead of being rendered inopera1 tivef'wouldjbe applied to the .pulley and could not be released'bytheelectromagnet until the apparatus hadbeen repaired. For example, if the spring 47 should'break, the

' brake lever 22 would be free to swing' about its'pivot and release'the brake shoe 18. 'Ihe spring 46, however, would remam operative to hold the brake shoe 17 applied, even if the releasing magnet were energized, because the y "core: 12` would then be pulled into contact with the'core 11. lThe core 11 can only be .-movedyinwardly lbythe pullof the magnet,

to'rele'ase the brake'jl? when a spring 47 '-1 s supplied to resist the inward pull onl the.,

`core 1,2. I, therefore, provide a simple and etlicient safeguard lagainst the emergency of 'the outert'face of the plate 49. i

hand ends of the rods 74 and 75 pass" a motor running away which might happen to an electric motor driving elevator apparatus 1n which case the car might not be stopped at the limits of travel without4 damage.

In Fig. '2 I have shown a-modiied form 'of vconstruction which will be found convenient 4when there is insuiicient room un-y der the brake pulley for both the electromagnet and the brake-applying springs. Fig. 1 shows-themore compact arrangementbut it will be lnoticed'that in Fig. 2 the mo- .tor shaft 2 is nearer the bed-plate 1, that is, it is lower. v In 4this case the electromagnet is placed above the brake pulley and springs beneath the same. It is obvious that the brake-applying means shown in Fig.l 1 could not be used in connection with the brake levers of Fig. 2 as the downwardly extend-v mg arms must be moved inwardly to apply the brake shoes.

In Fig. 2 one ofthe bearings for the motor shaft 2 is designated by the reference number ,85 and is shown back of the brake pulley in dotted lines'.y 58 and 59 are supports which are rigidly connected with the bed plate 1. The brake levers 19 and 20 are pivotally supported on .bearings at 23 and 24 at the upper ends'of the supports 58 and 59, respectively. Adjustably secured to the wardly and upwardly extending brackets 60 land 61, which support the electromagnet-SG.

I have in this'i'nstance shown the bracketsm integral with the lcylinder 8 of the electro-- magnet. The cap plates 9 and 10, cores 11 and 12, andA stems 27 and 28 are similar to these vshown invFig. l. I have shown collars 64 and 65, however, secured to the stems 27 and 28, respectively, to limit theinward movement of the cores. The stems 27. and

28 are pivotally connected at 62 63, respec-' upper ends of these supports are thel inr through the ar'i`ns90 and91, respectively, of v a small rocking lever 93 which is pivoted at 89 to the extreme lower end of the arm 15C# The screw-threaded portions 81 and 82 of the lrodsare providedwith the adjusting nuts 76, 77 to adjust the tension of the spring 47 and also-with lock nuts 78 and 79.

Pivotedat 88ste the extreme lower end of the rod 126' andy extendingv longitudinally through the-' axes of the helical springs 46 and 47 and through the enlarged opening 38 in the center of the standard 7 is a rod 87 of somewhat larger diameter than that of the rod 74 or'7 The left-hand end ot' this rod is screw-threaded at 80 and passes through the center of theplate 48. The screw-threaded portion is provided with an adjusting nut 7 0 to adjust the tension'of the spring 46. locking the nut 70 in place after justment has been made.

Fig. 2 shows the brake shoes 17 and 18 proper adapplied, the spring 46 exerting a pull on the rod 87 to the left and the' spring 47 exerting a pull on the rods 74 and7 5 to the right. The yrods 74 and 75 are placed at a sulicient distance from each other to propi erly retainthe springs 46 and 47 in place, that is, prevent any lateral'movement of the same. It will also be seen that when the magnet' 86 is energized to rock the brake levers 19 and 20 so asti) `release the brake shoes 17 and 18, the rbds passing through the springs will be lifted to a slight degree orthe reason that the pivotal points 89 and 88 will move inthe arc of a circle. The opening 38 in: the standard 7 is therefore of larger diameter `than the rod 87 to preventa binding, and the .openings 66 and 67 are of larger diameter than the rods 74 and 75, `respectively, for the same reason. In .order to allow free movement of the rods 74 and l7 5 through the' plate.48 the openings- 68 and 69 are made of larger diameter than the rods and to allow free'movelnent of the rod 87 through the plate 49 the opening 92 -in its center is of larger diameter than that oi rod. 87. Furthermore, in order to maintain thegrods v74 and 75 parallel and thus preventfbinding, said rods have a `pivotal connection with the arm 15 `through the lever 93 which is kept substantially vertical at all times. It will now be evident that if one .of the' brake levers or any of its connections should be broken so as to render the brake-applying means ineffective, the other brake-applying means would still be operative. For instance ii the rod 87 should be broken or become disconnected at 88 the spring 47 would still be'able to apply'the brakey shoe 17 and thus stop the motor. Even if both the rods 74 and 75 should break andthe spring 47 should be moved from itsnormal position,`the brake shoe 18 would be applied' to stop the motor. In

Fig.- 1 if the rod 39 should be removed, the' springs 46 and 47 therein shown would still be retained in place-and both brakes remain operative. -As in'Fig, 1 so also in Fig. 2, it either of theabrake-releasing means becomes inoperative one of the brakes would always be set andthe mechanism` would have to be repaired before themotor could' be started, unless, of course, some .outside means is employed to .hold thegbrake rc- A jam .nut 7l is also shown for leased against the action of` its spring, in which case the other brake could be operated successfully.

Without limiting myself' to 4the precise.

details of construction or arrangement ,of parts nereln disclosed, what 'I claim and' desire to have protected by Letters lFatent i of the United States is:

1. The combination with a movable ber, of a plurality of brakess therefor, independent brake-applying devices forv said brakes, and means for releasing one of said brakes dependent for its? operativeness upon yan operative condition of theapplying de-l viceforrthe other brake. f

2. The combinati`on`wi`th l'single member?, l of a plurality of brakes therefor, independentv devices for applying the brakes, and a single means for releasing the brakes dependent for its operativeness upon an operative condition vicesf i 3. The c'oiiibination with a rotatable niember, of brakelinechanism, devicesfor independently applyingseparateportions of the brake mechanism, and means dependent; upon an operative condition. of said devices for releasing said lportions of the brakkel mechanism. y 4. In brake mechanism, thecombination with a plurality of'brakes, of, independent resilient devices for applying the brakes,

and magnetic releasing means for one -of the of the brake-applying de-v brakes cooperating with and controlled by" the applying devicev for another of the brakes. Y

The combination with a rotatable mem-.l

ber, of a plurality of brakes, separate brakeapplying springs, independent connections between the springs and brakes, and means for releasing one brake controlled bythe applying spring for the other brake.

' 6. The combination with a brake pulley, of brakes, separate springs and connections for independently applying the brakes,'and an electromagnet comprising members connected respectively to the brakes and mov.

means for preventing the release of one of the-.brake shoes when the other shoe has been moved away from the brake pulley beyond a 9. The combination with a brake pulley, of two brake levers, two brake shoes, separate means'for independently operating the levers to apply the brake shoes, and an electromagnet having two members connected to the levers and movable into contact with' 4each other'when the brake shoes are released.

10. The combination with a brake pulley, of -two brake levers, brake shoes carried thereby, two brake springs and connections for independently applying the brakes,'-and an electromagnet having two cores connected to the levers and eachforming a linlit stop forthe other core.

15 oftwobrakexlevers, brake shoes, independf- 11.' The combination with a brake pulley,

ently'ioperative brake-applying springs, a stationary electro-magnet coil located between the brake levers, two magnet, cores connected to the'brake levers land having their' inner ends extending within the' coil and into proximity to each other. v.

' 12.,.Tl'1`e combination with a brake pulley, of two brake levers,ltwo brake shoes, two springs separately mounted, connections be- 4 tween-jsaid springs and levers, an electromagnet having two cores, and connections between said cores and levers.

I I 13. The combination with a brake pulley,

of'a double brake, of' separate and independent springs for applying said brake to said pulley,and an electro-magnet having two cores and. connectionsfor releasing ,said

brakeyf. 4 11.14. The .combination witha brake pulley,

of brake levers on`- opposite sides of said." pulley, brake shoes carried by'said leve-rs and restingon said pulley, brake-applyil'lg springs separately mounted below said pujlf.

ried by said levers, connections between saidl V- levers and said electromagnet, separate y brake-applying springs, and connections between said springs and levers. y16. The combinationl with a brakepulley, ofbrake levers, means for pivotally support- Aing said brake'.levers,'brake shoes carried by said levers, separate and 'independent springs, connections between lsaid springs .and the lower ends of said levers, a single electromagnet, and connections between said 4 electromagnet and the other ends of said' levers.

17. The combination with a brake pulley,

of two pivoted levers, a brake shoe carried by each of said levers, separate and independ-I ent brake-applying ysprings beneath said pulley, separate connections between said springs and the lower ends of' said levers,

an electro-magnet having two cores and mounted'above said pulley, andconnections i between saidl cores and the upper ends of said levers.

In testimony whereof, .I have signed my name to this specification in the presence of twosubscribing witnesses.

' JOHN D. IHLDER.

Witnesses:

W. H. STORES, GHAnLEs M. NIssEN. 

